The coating machine is mainly used for the surface coating process production of film, paper, etc. This machine is to coat the rolled substrate with a layer of glue, paint or ink with specific functions, and cut it into slices or roll after drying. 

It adopts a special multi-functional coating head, which can realize various forms of surface coating production. The winding and unwinding of the coating machine is equipped with a full-speed automatic film splicing mechanism, and the PLC program tension closed-loop automatic control.

brush

The brush coater is the oldest type of coating equipment, originally used in the 1850s for the production of coated wall wallpapers using china clay paints. There are 3 different types of brush applicators: round brush applicators, blanket roller applicators and blanket jacket applicators. Figure 1 shows an early brush coating head.

air knife

The advent of the air knife coater in the 1930s marked the birth of the modern paper coating industry. The air knife coater overcomes the above-mentioned shortcomings of the brush coater and is rapidly promoted, resulting in a sharp increase in the output of coated paper.

scraper type

The first blade coater patents appeared in the 1950s. Since then, knife coater technology has developed rapidly. According to the different feeding equipment, scraper type and scraper installation position, the scraper coating head is also divided into many types, such as hard-blade scraper coater, drag-knife scraper coater, soft-blade scraper coater, fountain type Material knife coater, short-dwell knife coater, Bill knife coater, roll coater, etc.

Roller

Roller coating is to apply coating to the coating surface with a coating roller, and this type of coating machine is mainly used for in-machine coating. The amount of coating can be adjusted by measuring the pressure between the rollers. If the pressure is strengthened, the passing amount of the paint will decrease, and the coating amount will also decrease.

 Types of Roll Coaters:

1. Squeeze roller coating head

2. Reverse roller coating head

3. Transfer roller coating head

4. Gravure roller coating head

spray coating

Spray coating technology is a non-contact coating method that uses controllable high-pressure spray technology to coat (sizing) one or both sides of paper or cardboard.

curtain coating

The multi-layer curtain coater can endow inkjet printing paper with a three-layer structure (bottom layer, absorber layer, etc.) and top layer) and the ability to obtain uniform coatings on uneven paper surfaces

Slot coating

The slit coating head includes a coating liquid storage tank; a pump, which is used to press the coating liquid in the coating liquid storage tank to the nozzle through the supply pipeline; a control part, which is used to control the work of the pump and the nozzle , The pressure detection part is used to detect the pipeline pressure, and when the pressure reaches a predetermined pressure condition, the nozzle discharges the coating liquid.

Use Principle

Application of automatic coating machine

It is suitable for glue coating of shoe materials, electronics industry, sponge, EVA, PE, cloth, etc.

tension system

1. Process requirements

The coating machine needs to evenly adhere glue or ink to the surface of aluminum foil, plastic film or cloth textiles. It has relatively high requirements on the coating process. It not only requires high uniformity of coating, but also needs to be able to achieve high-speed non-stop roll change to improve production efficiency.

2. Advantages of the program

The tension control at all levels is completed by the frequency converter, and the tension sensor is used to realize the tension control. The system is simple and stable. Use a PLC or a synchronous controller to control the speed of the drive roller inverter, and at the same time serve as the line speed signal of other inverters.

S350 closed-loop tension control (feeling vector control) easily achieves constant tension during acceleration and deceleration, saves space for installing tension rollers, and reduces mechanical costs. At the same time, high-precision control ensures a highly uniform coating effect.

The double-station rewinding and unwinding has a pre-drive function, which can meet the needs of high-speed non-stop automatic roll change and improve production efficiency. At the same time, accurate winding control can avoid bad winding of cabbage type and make the winding effect better.

work process

Coat the rolled base materials, such as paper, cloth, leather, aluminum foil, plastic film, etc. with a layer of glue, paint or ink with specific functions, and then wind up after drying.

The working principle of the automatic coating machine: the working principle of the automatic coating machine used for screen printing plate making is the same, but its performance varies according to different models and different manufacturers. The screen coating machine is equipped with a device that can clamp the screen frame on the vertical frame. The front and back of the screen area is a horizontal coating mechanism, which is composed of a coating tank and mechanical or pneumatic components that control the angle and pressure of the coating tank.

The two ends of the coating mechanism are installed on the vertical support arm of the coating machine. Through the transmission of belts, chains or cables, the coating mechanism moves up and down and coats along the surface of the screen. The transmission mechanism is connected to the servo or variable frequency motor to make it operate smoothly and precisely control the position of the coating mechanism.

Before coating, load the clean and stretched screen from the front of the coating machine, and some models can also load the screen from the side. In the models designed for large-format screen frames, side loading is more common, because the screen frame is large and heavy, side loading can make the lifting and moving amount smaller. Plate loading from the side is more convenient when the automatic screen coater is running in-line with other automatic screen handling equipment such as cleaning equipment, regeneration equipment, drying unit and developing machine.

Regardless of how the screen is loaded, once the screen is in the correct position, the pneumatic or mechanical clamps close to lock the screen. In order to make the operation more convenient, many models have foot pedals to control the plate clamp action, and the operator can free up both hands to control the screen plate. After the screen plate is installed, the corresponding photosensitive emulsion is poured into the automatic coating machine, and the coating can start. According to the functions of the control system and equipment, the equipment can coat both sides of the screen at the same time.

There are two coating methods, one is to coat the photosensitive emulsion on the screen through multiple wet-on-wet operations; or add a drying process after each coating. A machine that quantitatively coats liquid (or melt) polymer materials such as adhesives or coatings on the surface of the material.

Suitable for the production of soft substrates such as PVC/PE film

Simply put, glue is applied to the film. Specifically, it includes gluing, drying, winding and tension control.

The film can be PVC, PE, PET... or some paper, such as coating hot melt adhesive on the release paper.

troubleshooting

Coating machine transmission part wear

During the operation of the coating machine, the problem of wear of the transmission part often occurs, such as the wear of the shaft head of the coating machine dryer, the wear of the bearing chamber of the winding roll, etc. Traditional repair methods include surfacing welding, thermal spraying, electric brush plating, etc., but there are certain disadvantages: surfacing welding will cause the surface of the part to reach a high temperature, causing deformation or cracks, and in severe cases, it will cause shaft fracture; It can't be too thick, and the pollution is serious, and the application is also limited. The material has good adhesion and compressive strength, and can repair the wear of the coating machine on site without disassembly. At the same time, because of its lack of metal concessions, it can absorb the shock and vibration of the equipment well and avoid secondary wear.

Coater Concrete Foundation Damage

Due to the influence of corrosion, aging, equipment vibration and other factors, the coating machine will also cause damage to the concrete base and other parts, resulting in loosening of the bolts fastening the equipment, seriously affecting production. The traditional concrete pouring method will greatly prolong the repair time, which is unacceptable to many enterprises.